Longman Dictionary of Contemporary English homepage

obsession

 noun
     
ob‧ses‧sion [uncountable and countable]
an extreme unhealthy interest in something or worry about something, which stops you from thinking about anything elseCOLLOCATIONS COLLOCATIONS
become an obsession unhealthy/dangerous obsession sexual obsession national/American/British etc obsession to the point of obsession border on/upon obsession (=be almost as bad as an obsession)
Gambling became an obsession, and he eventually lost everything.
obsession with
an unhealthy obsession with being thin
The current obsession with exam results is actually harming children's education.
The game pachinko became a national obsession.
He has an enthusiasm for art, to the point of obsession in my opinion.
She looked after him with a devotion bordering on obsession.
—obsessional adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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